Bonding wire comprising zine-resisting primer and metal for low-temp. gas-shielded arc welding

Abstract

The invention relates to a metal flux-cored welding wire for gas-shielded arc welding with zinc primer-resistant performance and low-temperature impact toughness. The technical point is that in the metal-based flux, TiO is used to form and stabilize the three-component welding slag. 2 +SiO2 2 +Al 2 o 3 Oxide, which will account for 2-10% of the total weight of the wire; 0.1-1.0% metal fluoride; 0.1-0.25% metal Ti; 0.002-0.008% metal B. The mixed flux will be filled into a mild steel In the made skin. The metal flux-cored welding wire of the present invention smoothly discharges the welding smoke generated during the welding process by adjusting the formation of welding slag and the quantity and composition of the stabilizer. In this way, not only can the occurrence of welding defects such as pits and pores be suppressed to the greatest extent when welding steel coated with inorganic zinc primer, but also the low-temperature impact can be improved by adjusting the content of metal Ti and B and metal fluoride Value and welding performance; and to improve the welding performance of large structures such as shipbuilding or bridges to improve the quality of welding, shorten the construction period, and reduce costs.

Description

technical field [0001] The invention relates to a metal flux-cored welding wire for gas shielded arc welding with excellent zinc primer resistance performance and low-temperature impact toughness. In more detail, when welding a steel coated with an anti-rust zinc primer, welding defects will be caused due to the welding fume generated by the zinc primer. The present invention relates to a gas-shielded arc welding metal flux-cored wire for suppressing such defects and improving the low-temperature impact resistance of the welding part and the low-temperature impact toughness. Background technique [0002] At present, it is widely used in shipbuilding, bridges, steel frames and other large structural steel materials. Because of its large size, wall thickness, and various shapes, in most cases, it is electrolytically galvanized and hot-dip galvanized. Zinc technology, it will be impossible to carry out mass production, and at the same time the construction period is very long....

AI Technical Summary

Problems solved by technology

However, these methods generate excessive spatter due to adverse effects on the covering performance of the welding slag and the shape of the welding bead, or because the flux contains a large amount of alkaline substances; The shape is deteriorated, and the expansion and contraction rate of the bead will be reduced, which in turn will reduce the impact toughness at low temperature

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